Oil Pressure Diagnosis and Testing
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Oil Pressure Diagnosis and Testing
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Special Tools
EN 21867-850
Oil Pressure Gauge Adapter
For equivalent regional tools, refer to
Special Tools
.
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With the vehicle on a level surface, allow adequate drain down time of 2-3 minutes and measure for a low oil level.
Add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
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Run the engine, and verify low, or no oil pressure on the vehicle gauge or light.
Listen for a noisy valve train or a knocking noise.
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Oil diluted by moisture or unburned fuel mixtures
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Improper oil viscosity for the expected temperature
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Incorrect or malfunctioning oil pressure sender
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Incorrect or malfunctioning oil pressure gauge
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Malfunctioning oil bypass valve
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Remove the oil pressure sender or another engine block oil gallery plug.
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Install
EN 21867-850
adapter and an oil pressure gauge and measure the engine oil pressure.
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If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
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Oil pump screen loose, plugged, or damaged
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Oil pump screen O-ring seal missing or damaged
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Oil pump to oil pump pipe and screen assembly gasket missing or damaged
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Oil pump pipe and screen assembly restrictions or damaged
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Oil pump driven gear damaged or loose
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Oil pump drive gear damaged
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Malfunctioning oil pump pressure regulator valve
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Cracked, porous or restricted oil galleries
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Oil cooler restrictions
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Oil cooler O-rings damaged or missing
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Cracked, porous or restricted oil galleries
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Damaged or missing oil spray cooling nozzles
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